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  <title>简介</title>

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</div><hr /><div id="intro.http" class="preface">
  <h1 class="title">简介</h1>
  <p class="simpara">
   The HTTP extension aims to provide a convenient and powerful
   set of functionality for major applications.
  </p>
  <p class="simpara">
   The HTTP extension eases handling of HTTP URLs, dates, redirects, 
   headers and messages in a HTTP context (both incoming and outgoing). 
   It also provides means for client negotiation of preferred language 
   and charset, as well as a convenient way to exchange arbitrary data 
   with caching and resuming capabilities.
  </p>
  <p class="simpara">
   Also provided is a powerful request and parallel interface (PHP 5+), 
   if the extension is built with cURL support.
  </p>
  <p class="simpara">
   Additionally to the API reference in this manual you can find
   information about how to install and configure as well as
   which global constants are predefined in the following sections:
  </p>
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